Accession Number:

ADA422633

Title:

Superconducting Qubits for Quantum Computation

Descriptive Note:

Final rept. 1 Sep 1999-31 Aug 2003

Corporate Author:

STATE UNIV OF NEW YORK AT STONY BROOK RESEARCH FOUNDATION

Personal Author(s):

Report Date:

2003-11-30

Pagination or Media Count:

8.0

Abstract:

Superconducting Quantum Interference Devices SQUIDs have been studied to determine their suitability for use as qubits in quantum computers. It has been demonstrated, using spectroscopic measurements, that it is possible to place such a SQUID in a coherent superposition of 0 and 1 quantum states as required for use as a qubit. A transformer for the controllable coupling of flux qubits one of the key components needed for a quantum computer has been developed. Theoretical techniques for the analysis of experimental, multilevel qubit systems have been developed. Analysis has been done for Aharonov-Casher qubits that allow access to all key variables and for quantum-limited JJ comparator readouts. The theory of linear detection has been extended to quadratic detectors. Our fabrication capability has been upgraded to yield high-quality Nb qubits less than 1 pA subgap leakage current at 0.3 K with a 1 week turn around.

Subject Categories:

  • Electrical and Electronic Equipment
  • Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE